Is that necessarily true? With a scheme like key escrow, is there a sure-fire way to detect a hacker as opposed to an authorized user accessing data? At the ver

Is that necessarily true? With a scheme like key escrow, is there a sure-fire way to detect a hacker as opposed to an authorized user accessing data? At the very least it seems that if the NSA itself or some other agency were hacked (again) then this problem would still exist. The NSA has notably lacked this type of audit trail in their systems before, hence their inability to track Snowden.